Les paquets suivants contiennent des dépendances non satisfaites : gwenview : Dépend: libkf5activities5 (>= 4.96.0) mais il n'est pas installable
Maximiliam already started to upload KDE Frameworks 5.8 packages.
Which brings nothing before we get the rest...
What I think is possible might be to apt-get source them or git clone them from their debian repo´s and build from there. But you need to build them in the right order for build dependencies to work out okay.
Package have been build I guess, so why not put them on an equivalent of qt-kde.debian.org like tis has been done often in the past?
-- eric